It was 5 Red Berries, but Carrots is added to that list if you are using the version that allows you to give the stallion/mare them to raise his/her energy up, so those are the 2 foods they can be fed to raise energy.
Thank you! I completely forgot about the carrots that Bernard sells.
No problem, and one of the updates mention Carrots as one of the other items to feed the horses with other than red berries.
